GluR3B Ab’s induced oligodendrocyte precursor cells excitotoxicity via mitochondrial dysfunction

Abstract Studies have indicated that glutamate receptor subunit 3 peptide B antibodies (GluR3B Ab’s) by directing against a-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid subtype glutamate receptors (AMPARs) subunit 3 (GluR3B) was involved in the hippocampal neuron damage in the pathogenesis of epilepsy. Glutamate accumulation is critical for oligodendrocyte precursors (OPCs) excitotoxic injury. However, remarkably little is known about whether GluR3B Ab’s causes OPCs excitotoxicity, and the underlying mechanisms remain unclear. In this study, we found that the survival rate of OPCs decreased, apoptosis increased and the release of LDH increased with GluR3B Ab’s treatment. GluR3B Ab’s enhanced the level of intracellular Ca 2+ and reactive oxygen species (ROS), caused mitochondrial potential collapse measured by JC-1 and promoted mitochondrial cytochrome C release. AMPARs antagonist NBQX reversed OPCs apoptosis caused by GluR3B Ab’s. Taken together, these data suggests that AMPAR was involved in GluR3B Ab’s-induced OPCs toxicity by mitochondrial dysfunction. The study revealed a new mechanism for OPCs excitotoxicity in many central nervous system diseases such as epilepsy.